/**
 * #      1249
 * 名称   移除无效的括号
 * 链接   https://leetcode-cn.com/problems/minimum-remove-to-make-valid-parentheses
 * 题解   [241](https://leetcode-cn.com/problems/minimum-remove-to-make-valid-parentheses/solution)
 * 通过率 56.6%
 * 难道   中等
 */

